 /*
   * Copyright 2012 The Netty Project
   *
   * The Netty Project licenses this file to you under the Apache License,
   * version 2.0 (the "License"); you may not use this file except in compliance
   * with the License. You may obtain a copy of the License at:
   *
   *   https://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
   * License for the specific language governing permissions and limitations
   * under the License.
   */
 package com.rs.caht.netty.websocket.officialdemo;
  
  import io.netty.channel.ChannelInitializer;
  import io.netty.channel.ChannelPipeline;
  import io.netty.channel.socket.SocketChannel;
  import io.netty.handler.codec.http.HttpObjectAggregator;
  import io.netty.handler.codec.http.HttpServerCodec;
  import io.netty.handler.codec.http.websocketx.WebSocketServerProtocolHandler;
  import io.netty.handler.codec.http.websocketx.extensions.compression.WebSocketServerCompressionHandler;
  import io.netty.handler.ssl.SslContext;
  
  /**
   */
  public class WebSocketServerInitializer extends ChannelInitializer<SocketChannel> {
  
      private static final String WEBSOCKET_PATH = "/websocket";
  
      private final SslContext sslCtx;
  
      public WebSocketServerInitializer(SslContext sslCtx) {
          this.sslCtx = sslCtx;
      }
  
      @Override
      public void initChannel(SocketChannel ch) throws Exception {
          ChannelPipeline pipeline = ch.pipeline();
          if (sslCtx != null) {
              pipeline.addLast(sslCtx.newHandler(ch.alloc()));
          }
          //将请求和应答消息解码为HTTP消息
          pipeline.addLast(new HttpServerCodec());
          //将HTTP消息的多个部分合成一条完整的HTTP消息
          pipeline.addLast(new HttpObjectAggregator(65536));
          pipeline.addLast(new WebSocketServerCompressionHandler());
          pipeline.addLast(new WebSocketServerProtocolHandler(WEBSOCKET_PATH, null, true));
          pipeline.addLast(new WebSocketIndexPageHandler(WEBSOCKET_PATH));
          pipeline.addLast(new WebSocketFrameHandler());
      }
  }